Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
Weil-McLain EG-45 and Weil-McLain EG-50 are two non-condensing boilers from the Weil-McLain EG / EG Steam line. The Weil-McLain EG-45 is rated 150 MBH input, 127 MBH DOE heating capacity, water and 84% AFUE, water, and the Weil-McLain EG-50 is rated 175 MBH input, 148 MBH DOE heating capacity, water and 84% AFUE, water. Weil-McLain EG-50 lists 25 MBH more input than Weil-McLain EG-45 (175 MBH against 150 MBH). Both list the same published AFUE, water of 84%. Weil-McLain EG-50 lists 80 lb more shipping weight than Weil-McLain EG-45 (585 lb against 505 lb).
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Weil-McLain EG-45 | Weil-McLain EG-50 |
|---|---|---|
| Input, maximum | 150 MBH | 175 MBH |
| Boiler water content | 14.8 gal | 17.3 gal |
| Weight | 505 lb | 585 lb |
| Venting | Category I, B-vent — vertical vent only, natural draft with draft hood and automatic vent damper; 6" I.D. chimney x 20 ft | Category I, B-vent — vertical vent only, natural draft with draft hood and automatic vent damper; 7" I.D. chimney x 20 ft |
| Gas connection | 1/2" | 1/2" |
| DOE heating capacity, water | 127 MBH | 148 MBH |
| DOE heating capacity, steam | 124 MBH | 145 MBH |
| Net AHRI rating, water | 110 MBH | 129 MBH |
| Net AHRI rating, steam | 93 MBH | 109 MBH |
| Net AHRI steam rating, area | 388 sq ft | 454 sq ft |
| AFUE, water | 84 % | 84 % |
| AFUE, steam | 82 % | 82 % |
| Supply connection | 3" | 3" |
| Return connection | 2-1/2" | 2-1/2" |
| Relief valve | 3/4" tapping | 3/4" tapping |
| Steam-to-waterline content | 9.8 gal | 11.2 gal |
Published ratings: the Weil-McLain EG-45 is rated 150 MBH input, 127 MBH DOE heating capacity, water and 84% AFUE, water; the Weil-McLain EG-50 is rated 175 MBH input, 148 MBH DOE heating capacity, water and 84% AFUE, water. Weil-McLain EG-50 lists 25 MBH more input than Weil-McLain EG-45 (175 MBH against 150 MBH). Both list the same published AFUE, water of 84%.
Weil-McLain EG-50 lists 80 lb more shipping weight than Weil-McLain EG-45 (585 lb against 505 lb). The boiler water content differs: the Weil-McLain EG-45 lists 14.8 gal, while the Weil-McLain EG-50 lists 17.3 gal. The venting differs: the Weil-McLain EG-45 lists Category I, B-vent — vertical vent only, natural draft with draft hood and automatic vent damper; 6" I.D. chimney x 20 ft, while the Weil-McLain EG-50 lists Category I, B-vent — vertical vent only, natural draft with draft hood and automatic vent damper; 7" I.D. chimney x 20 ft. The steam-to-waterline content differs: the Weil-McLain EG-45 lists 9.8 gal, while the Weil-McLain EG-50 lists 11.2 gal.
Both records print the same gas connection (1/2"), AFUE, water (84%), AFUE, steam (82%) and supply connection (3"), per the cited sources.
Weil-McLain
The EG-45 is the 150 MBH EG size: 127/124 MBH water/steam DOE heating capacity, 388 sq ft of steam coverage, 84%/82% AFUE and a 6" I.D. chimney — discontinued in Canada, current in the US.
Weil-McLain
The EG-50 moves the EG range to 175 MBH input with 148/145 MBH water/steam DOE heating capacity, 454 sq ft of steam coverage, 84%/82% AFUE and a 7" I.D. chimney; discontinued in Canada, current in the US.
The Weil-McLain EG-50 lists 175 MBH, against 150 MBH on the Weil-McLain EG-45, per the cited documentation.
Both list the same AFUE, water of 84%.
It ships at 585 lb against 505 lb for the Weil-McLain EG-45, per the cited sources.
A consultation includes a heat-loss review so the size is right the first time.
On-site service in Greater Vancouver, BC. ROMA lists “Open 7 days” on its site; call to confirm same-day availability.
Sources and verification
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.